EP4302671A1 - Dishwasher - Google Patents

Dishwasher Download PDF

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Publication number
EP4302671A1
EP4302671A1 EP22763473.0A EP22763473A EP4302671A1 EP 4302671 A1 EP4302671 A1 EP 4302671A1 EP 22763473 A EP22763473 A EP 22763473A EP 4302671 A1 EP4302671 A1 EP 4302671A1
Authority
EP
European Patent Office
Prior art keywords
spray
blade
wash water
bubble generator
flow path
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP22763473.0A
Other languages
German (de)
English (en)
French (fr)
Inventor
Youmin Lee
Jindong Kim
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
LG Electronics Inc
Original Assignee
LG Electronics Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by LG Electronics Inc filed Critical LG Electronics Inc
Publication of EP4302671A1 publication Critical patent/EP4302671A1/en
Pending legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/14—Washing or rinsing machines for crockery or tableware with stationary crockery baskets and spraying devices within the cleaning chamber
    • A47L15/18—Washing or rinsing machines for crockery or tableware with stationary crockery baskets and spraying devices within the cleaning chamber with movably-mounted spraying devices
    • A47L15/22—Rotary spraying devices
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/14—Washing or rinsing machines for crockery or tableware with stationary crockery baskets and spraying devices within the cleaning chamber
    • A47L15/18—Washing or rinsing machines for crockery or tableware with stationary crockery baskets and spraying devices within the cleaning chamber with movably-mounted spraying devices
    • A47L15/22—Rotary spraying devices
    • A47L15/23—Rotary spraying devices moved by means of the sprays
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/02—Washing or rinsing machines for crockery or tableware with circulation and agitation of the cleaning liquid in the cleaning chamber containing a stationary basket
    • A47L15/08—Washing or rinsing machines for crockery or tableware with circulation and agitation of the cleaning liquid in the cleaning chamber containing a stationary basket by application of a pressure effect produced by pumps
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/02—Washing or rinsing machines for crockery or tableware with circulation and agitation of the cleaning liquid in the cleaning chamber containing a stationary basket
    • A47L15/10—Washing or rinsing machines for crockery or tableware with circulation and agitation of the cleaning liquid in the cleaning chamber containing a stationary basket by introducing compressed air or other gas into the liquid
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/42—Details
    • A47L15/4214—Water supply, recirculation or discharge arrangements; Devices therefor
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/42—Details
    • A47L15/4278—Nozzles
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/42—Details
    • A47L15/4278—Nozzles
    • A47L15/428—Rotary nozzles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B3/00—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements
    • B05B3/02—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements
    • B05B3/04—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements driven by the liquid or other fluent material discharged, e.g. the liquid actuating a motor before passing to the outlet
    • B05B3/06—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements driven by the liquid or other fluent material discharged, e.g. the liquid actuating a motor before passing to the outlet by jet reaction, i.e. creating a spinning torque due to a tangential component of the jet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/02—Spray pistols; Apparatus for discharge
    • B05B7/04—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge
    • B05B7/0416—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge with arrangements for mixing one gas and one liquid
    • B05B7/0425—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge with arrangements for mixing one gas and one liquid without any source of compressed gas, e.g. the air being sucked by the pressurised liquid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B9/00—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour
    • B05B9/002—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour incorporating means for heating or cooling, e.g. the material to be sprayed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B9/00—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour
    • B05B9/03—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material
    • B05B9/04—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material with pressurised or compressible container; with pump
    • B05B9/0403—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material with pressurised or compressible container; with pump with pumps for liquids or other fluent material
    • B05B9/0423—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material with pressurised or compressible container; with pump with pumps for liquids or other fluent material for supplying liquid or other fluent material to several spraying apparatus
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L2601/00—Washing methods characterised by the use of a particular treatment
    • A47L2601/02—Pressurised cleaning liquid delivered by a pump
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L2601/00—Washing methods characterised by the use of a particular treatment
    • A47L2601/03—Pressurised, gaseous medium, also used for delivering of cleaning liquid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B9/00—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour
    • B05B9/03—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material
    • B05B9/04—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material with pressurised or compressible container; with pump
    • B05B9/0403—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material with pressurised or compressible container; with pump with pumps for liquids or other fluent material
    • B05B9/0416—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material with pressurised or compressible container; with pump with pumps for liquids or other fluent material with pumps comprising rotating pumping parts, e.g. gear pump, centrifugal pump, screw-type pump

Definitions

  • the present disclosure relates to a dishwasher.
  • a dishwasher is a home appliance that removes food residue remaining on dishes by spraying wash water.
  • Korean Laid-Open Patent Publication No. KR 10-2018-0015929 which is hereby incorporated by reference, discloses a dishwasher including a microbubble generator configured to generate microbubbles in wash water to increase washing performance.
  • microbubbles are generated in wash water sprayed onto the dishes for the purpose of achieving chemical cleaning ability using the activating effect of detergent to improve the washing performance.
  • a washing pump is connected to a tub by using the lower space of the tub.
  • Such a structure may require a complicated flow path structure and cause an increase in the number of parts for flow path connection and material costs.
  • air intake noise is exposed to the outside. Therefore, an additional part for noise reduction is required in order to address this problem.
  • a dishwasher includes: a tub defining a washing space; a sump disposed below the tub and configured to store wash water therein; a pump configured to supply the wash water stored in the sump to the tub; and a spray arm configured to supply wash water flowing from the pump to the washing space.
  • the spray arm includes: a spray blade configured to spray wash water into the washing space; a bubble generator configured to supply wash water containing a microbubble to the washing space; and a hub configured to supply wash water discharged from the pump to the spray blade or the bubble generator.
  • the spray arm may spray wash water through the spray blade while simultaneously generating a microbubble through the bubble generator, allowing wash water containing microbubbles to be supplied to the washing space.
  • a flow path area of an inlet end of the bubble generator may be less than a flow path area of an inlet end of the spray blade, thereby achieving the flow rate of wash water sprayed toward the dishes and maintaining the spray pressure of wash water at a certain level or higher.
  • the bubble generator may have therein a bubble generation flow path to generate the microbubble.
  • the bubble generation flow path may include: a first expansion passage extending from an inlet end of the bubble generator and providing an increased flow path cross-sectional area; a reduction passage extending from the first expansion passage and providing a decreased flow path cross-sectional area; and a second expansion passage extending from the reduction passage and providing an increased flow path cross-sectional area.
  • An inlet hole through which air is introduced may be formed between the reduction passage and the second expansion passage, thereby generating microbubbles in wash water passing through the bubble generator.
  • the bubble generation flow path may further include an inlet passage connected to an inside of the hub.
  • a length of the inlet passage in a flow direction of wash water may be greater than a diameter of the inlet passage, allowing the flow rate of wash water introduced into the bubble generator to be small.
  • the bubble generator may be provided with an air flow path to supply air outside the bubble generator to the inlet hole.
  • the air flow path may be formed in a direction perpendicular to the bubble generation flow path, allowing air inside the tub to be introduced into the bubble generation flow path.
  • the air flow path may have a bent structure, thereby preventing foreign matter in the tub from entering the bubble generator.
  • the bubble generation flow path may further include an extension passage that extends from the second expansion passage.
  • the bubble generator may have a plurality of holes to discharge wash water flowing through the extension passage, allowing microbubbles generated in the bubble generator to be discharged to the tub.
  • the plurality of holes may be formed in a top surface or a bottom surface of the bubble generator, allowing microbubbles generated in the bubble generator to be discharged to the tub.
  • the spray blade may include a first spray blade that extends from the hub in one direction, and a second spray blade that extends from the hub in an opposite direction to the first spray blade.
  • the bubble generator may include a first bubble generator that extends from the hub in another direction, and a second bubble generator that extends from the hub in an opposite direction to the first bubble generator.
  • the first spray blade and the second spray blade may be disposed to cross the first bubble generator and the second bubble generator. That is, two spray blades and two bubble generators may be arranged to intersect each other to thereby secure wash water sprayed toward the dishes while achieving the amount of microbubble generation at a certain level or higher.
  • the first spray blade and the second spray blade may each be provided on a top surface thereof with a plurality of spray nozzles.
  • the plurality of spray nozzles may be configured to spray wash water in an inclined direction of the top surface of each of the first spray blade and the second spray blade, thereby causing the spray arm to rotate in one direction.
  • a dishwasher in another aspect, includes: a tub defining a washing space; a sump disposed below the tub and configured to store wash water therein; a pump configured to supply the wash water stored in the sump to the tub; and a spray arm assembly configured to supply wash water flowing from the pump to the washing space.
  • the spray arm assembly includes: a spray arm rotatably disposed on the tub and configured to spray wash water into the washing space; a fixed gear part fixed to one side of the tub; a rotating gear part rotatably mounted to a bottom surface of the spray arm and engaged with the fixed gear part; and a link member mounted to the spray arm and connected to the rotating gear part.
  • the spray arm includes: a spray blade configured to spray wash water into the washing space and configured to allow the spray arm to rotate in a first direction; a moving blade configured to spray wash water into the washing space, and allowing, according to placement, the spray arm to rotate in the first direction or a second direction opposite to the first direction; a bubble generator configured to supply wash water containing a microbubble to the washing space; and a hub configured to supply wash water discharged from the pump to the spray blade, the bubble generator, or the moving blade.
  • the link member may change the placement of the moving blade according to rotation of the rotating gear part, thereby allowing the spray arm assembly to rotate in both directions while generating microbubbles in the spray arm.
  • a flow path area of an inlet end of the bubble generator may be less than a flow path area of an inlet end of the spray blade or a flow path area of an inlet end of the moving blade, thereby securing the amount of wash water sprayed toward the dishes.
  • the moving blade may include a fixed tube that is disposed to be fixed to the hub and extends from the hub, and a moving tube that is rotatably disposed on the fixed tube, allowing the direction of wash water sprayed from the moving blade to be changed.
  • the spray blade may include a first spray blade that extends from the hub in one direction, and a second spray blade that extends from the hub in an opposite direction to the first spray blade.
  • the moving blade may be disposed to extend from the hub between the first spray blade and the second spray blade.
  • the bubble generator may be disposed to extend from the hub in an opposite direction to the moving blade.
  • the rotating gear part may be rotatably disposed on a bottom surface of the spray blade.
  • the link member may include a first extension portion mounted to the first spray blade, a second extension portion mounted to the second spray blade, a third extension portion mounted to the bubble generator, and a fourth extension portion mounted to the moving blade.
  • the rotating gear part may include a protrusion that is radially spaced apart from a rotation axis of the rotating gear part and protrudes to one side.
  • the first extension portion may be provided with a guide groove into which the protrusion is inserted and converting a rotary motion of the protrusion to a linear motion of the link member in one direction to thereby covert a rotary motion of the rotating gear part to a linear motion of the link member, allowing the placement of the moving blade to be changed.
  • the dishwasher according to the present disclosure has one or more of the following effects.
  • a spray arm includes a spray blade to spray wash water and a bubble generator configured to generate a microbubble
  • microbubbles can be generated and sprayed toward the dishes. Since it does not require a separate space for the bubble generator or a separate configuration, unnecessary space in the dishwasher can be removed, and costs can be reduced.
  • wash water is sprayed onto the dishes by adjusting the flow rate in the spray arm, and wash water containing the microbubbles is ultimately sprayed onto the dishes by generating microbubbles, the washing performance of the dishwasher can be improved.
  • the dishwasher of the present disclosure includes a cabinet 10 that defines an outer shape, a tub 12 that is disposed inside the cabinet 10 and defines a washing space 14, a sump 16 that is disposed below the tub 12 and stores wash water temporarily, a rack (18a, 18b) that is disposed inside the tub 12 and on which dishes are placed, a spray arm (22, 24) that sprays wash water into the washing space 14, and a washing pump 30 that supplies the wash water stored in the sump 16 to the spray arm (22, 24).
  • the washing pump 30 may be disposed separately from the sump 16.
  • the washing pump 30 includes a pump housing 32 that defines an outer shape, an impeller 34 that causes wash water to flow, and a heater 36 that heats water in the pump housing 32.
  • the dishwasher 1 includes an upper rack 18a, a lower rack 18b disposed below the upper rack 18a, a lower spray arm 22 rotatably disposed below the lower rack 18b to spray wash water, an upper spray arm 24 rotatably disposed below the upper rack 18a to spray wash water, and a top spray nozzle 26 disposed at an upper end portion of the washing space 14 to spray wash water downward.
  • the dishwasher 1 includes a switching valve 38 to supply wash water discharged from the washing pump 30 to the lower spray arm 22, the upper spray arm 24, or the top spray nozzle 26.
  • the dishwasher 1 may further include a water supply pipe 40 to supply wash water from an external water source, a water supply valve 42 to open and close the water supply pipe 40, a discharge pipe 44 to discharge wash water stored in the sump 16 to the outside, and a discharge pump 46 that discharges wash water stored in the sump 16 to the outside through the discharge pipe 44.
  • a water supply pipe 40 to supply wash water from an external water source
  • a water supply valve 42 to open and close the water supply pipe 40
  • a discharge pipe 44 to discharge wash water stored in the sump 16 to the outside
  • a discharge pump 46 that discharges wash water stored in the sump 16 to the outside through the discharge pipe 44.
  • the spray arm 52 described herein may be the lower spray arm 22 shown in FIG. 1 . However, the spray arm 52 may also be applicable to the upper spray arm 24 shown in FIG. 1 .
  • the spray arm 52 may include a plurality of blades (56a, 56b, 60a, 60b) that extend in different directions and spray wash water into the washing space 14, and a hub 54 that supplies wash water discharged from the washing pump 30 to the plurality of blades (56a, 56b, 60a, 60b).
  • the hub 54 may form a flow path or passage in an up-and-down or vertical direction to allow the wash water supplied from the washing pump 30 to flow upward.
  • the plurality of blades (56a, 56b, 60a, 60b) may be disposed on an upper end portion of a peripheral surface 54b of the hub 54.
  • the spray arm 52 may consist of an upper cover 52a and a lower cover 52b.
  • the upper cover 52a and the lower cover 52b may be coupled to each other to define therein a flow path through which wash water flows.
  • the hub 54 has an opening 54a open at bottom.
  • the hub 54 is disposed at the lower cover 52b.
  • the plurality of blades include a spray blade 56a, 56b to spray wash water into the washing space 14, and a bubble generator 60 having therein a venturi tube-shaped flow path to supply wash water containing a microbubble to the washing space.
  • the bubble generator 60 supplies a microbubble to the washing space.
  • the microbubble may refer to a plurality of bubbles crushed into fine size in the wash water.
  • the spray arm 52 includes two spray blades 56a and 56b, and two bubble generators 60.
  • the spray blade 56a, 56b includes a first spray blade 56a that extends from the hub 54 in one direction, and a second spray blade 56b that extends in a different direction from the first spray blade 56a.
  • the first spray blade 56a and the second spray blade 56b are each provided on its top surface with a plurality of spray nozzles 59.
  • the plurality of spray nozzles 59 may spray wash water in an inclined direction of the top surface of each of the first spray blade 56a and the second spray blade 56, thereby causing the spray arm 52 to rotate in one direction.
  • the spray blade 56a, 56b is provided therein with a spray flow path 57 through which wash water supplied from the hub 54 flows.
  • a cross-sectional area of the spray flow path 57 may decrease as a distance from the hub 54 increases.
  • the bubble generator 60 includes a first bubble generator 60a that extends from the hub 54 in one direction, and a second bubble generator 60b that extends in a different direction from the first bubble generator 60a.
  • the first bubble generator 60a and the second bubble generator 60b may be arranged to extend in opposite directions between the first spray blade 56a and the second spray blade 56b. Referring to FIG. 3 , the first bubble generator 60a and the second bubble generator 60b may each be disposed substantially perpendicular to the first spray blade 56a and the second spray blade 56b.
  • the bubble generator 60 is provided therein with a bubble generation flow path 62 of a venturi-tube shape.
  • the bubble generation flow path 62 includes an inlet passage 66 that is connected to the hub 54, a first expansion passage 68 that is connected to the inlet passage 66 and in which the cross-sectional area of the flow path increases, a reduction passage 70 that is connected to the first expansion passage 68 and in which the cross-sectional area of the flow path decreases, a second expansion passage 72 that is connected to the reduction passage 70 and in which the cross-sectional area of the flow path increases again, and a discharge passage 74 that is connected to the second expansion passage 72 and discharges wash water to the outside.
  • the flow path area of an inlet end 64 of the bubble generator 60 is formed smaller than the flow path area of an inlet end 58 of the spray blade 56a, 56b. That is, the flow path cross-sectional area of the inlet passage 66 is less than the area of an inlet end of the spray flow path 57 formed inside the spray blade 56a, 56b. As the amount of wash water supplied to the spray blade 56a, 56b is greater than the amount of wash water supplied to the bubble generator 60, washing performance may be achieved.
  • the first expansion passage 68 extends from the inlet passage 66 in the flow direction of wash water.
  • the increase rate of the cross-sectional area of the first expansion passage 68 may be greater than the increase rate of the cross-sectional area of the second expansion passage 72.
  • the flow rate of wash water flowing through the bubble generation flow path 62 may be achieved.
  • the reduction passage 70 extends from the first expansion passage 68 in the flow direction of wash water. As the cross-sectional area of the flow path gradually decreases, the pressure of wash water flowing through the reduction passage 70 may be reduced. By adjusting the ratio of the flow path cross-sectional area of the reduction passage 70, the pressure at an outlet end of the reduction passage 70 may be lower than the atmospheric pressure.
  • An air hole 78 in communication with an outside of the bubble generator 60 is formed at the outlet end of the reduction passage 70.
  • the bubble generator 60 is provided with an air flow path 80 through which the bubble generation flow path 62 and the outside of the bubble generator 60 communicate with each other.
  • the air hole 78 provides communication between the air flow path 80 and the bubble generation flow path 62.
  • the air hole 78 is disposed between the reduction passage 70 and the second expansion passage 72. Accordingly, air may be introduced into the outlet end of the reduction passage 70 in which wash water with reduced pressure flows.
  • the air flow path 80 may be formed in a direction perpendicular to the bubble generation flow path 62. Referring to FIG. 8 , the air flow path 80 may have a bent shape. Due to the bent shape of the air flow path 80, foreign matter be prevented from entering the bubble generation flow path 62.
  • Air outside the bubble generator 60 may flow into the bubble generation flow path 62 through the air flow path 80.
  • the second expansion passage 72 extends from the reduction passage 70. As the pressure of wash water flowing through the second expansion passage 72 increases, air introduced into the air hole 78 may be crushed. That is, the air included in the wash water flowing through the second expansion passage 72 may be crushed due to a pressure increase in the wash water to thereby generate microbubbles.
  • the discharge passage 74 extends from the second expansion passage 72.
  • the flow path area of the discharge passage 74 may be maintained or partially reduced in the flow direction of wash water.
  • a plurality of discharge holes 76 are formed in the bubble generator 60 in which the discharge passage 74 is provided.
  • the plurality of discharge holes 76 may be formed on the top or bottom of the bubble generator 60.
  • the spray arm 52 may include a plurality of blades (56a, 56b, 60, 82) that extend in different directions and spray wash water into the washing space 14, and a hub 54 that supplies wash water discharged from the washing pump 30 to the plurality of blades (56a, 56b, 60, 82).
  • the plurality of blades (56a, 56b, 60, 82) include two spray blades 56a and 56b that extend in different directions, one bubble generator 60, and one moving blade 82.
  • the two spray blades 56a and 56b extend in opposite directions with respect to the hub 54.
  • the spray blade 56a, 56b includes a first spray blade 56a that extends from the hub 54 in one direction, and a second spray blade 56b that extends in a different direction from the first spray blade 56a.
  • a top surface (57a, 57b) of each of the first spray blade 56a and the second spray blade 56b may have a shape inclined to the ground in one direction.
  • the top surface 57a of the first spray blade 56a and the top surface 57b of the second spray blade 56b may be configured as inclined surfaces formed in different directions from each other.
  • the spray arm 52 may be rotated in a direction opposite to a direction in which the wash water is sprayed. That is, the first spray blade 56a and the second spray blade 56b may allow the spray arm 52 to rotate in a first direction.
  • the moving blade 82 is disposed between the first spray blade 56a and the second spray blade 56b.
  • the moving blade 82 may reciprocate in an extension direction from the hub 54 as a rotation axis.
  • the moving blade 82 includes a fixed tube 84 that is disposed to be fixed to the hub 54 and extends from the hub 54, and a moving tube 88 that is rotatably disposed on the fixed tube 84.
  • the fixed tube 84 is provided at its end portion with a bridge 86 that is inserted into the moving tube 88 and defines a flow path through which wash water flows.
  • An upper surface 88a of the moving tube 88 is provided with a plurality of spray holes 88b through which wash water flowing inside is sprayed to the outside.
  • the moving tube 88 is disposed on the fixed tube 84 to be movable in a circumferential direction.
  • the moving tube 88 is connected to a link member 98, which will be described later, so as to change a direction that the spray hole 88b faces. According to the placement or disposition, the moving tube 88 may allow the spray arm 52 to rotate in a second direction.
  • the spray arm 52 may be a part of a spray arm assembly 50 rotating clockwise or counterclockwise within the tub 12.
  • the spray arm assembly 50 may include a spray arm 52 that is provided with a plurality of blades (56a, 56b, 60, 82), a fixed gear part 90 that is mounted on one side of the tub 12, an arm holder 92 that is coupled to the spray arm 52 and fixed to the spray arm 52, a flow path switching part 94 that is accommodated in the arm holder 92 and is configured to change the flow path of wash water supplied to the spray arm, a rotating gear part 96 that is rotatably mounted to a bottom surface of the spray arm and is engaged with the fixed gear part, and a link member 98.
  • a spray arm 52 that is provided with a plurality of blades (56a, 56b, 60, 82)
  • a fixed gear part 90 that is mounted on one side of the tub 12
  • an arm holder 92 that is coupled to the spray arm 52 and fixed to the spray arm 52
  • a flow path switching part 94 that is accommodated in the arm holder 92 and is configured to change the flow path of wash water supplied to
  • the fixed gear part 90 may be mounted to a bottom surface of the tub 12.
  • the fixed gear part 90 may be mounted to a sump cover (not shown) disposed on top of the sump 16.
  • the fixed gear part 90 is disposed to be engaged with the rotating gear part 96.
  • the rotating gear part 96 may rotate in mesh with the circumference of the fixed gear part 90.
  • the arm holder 92 may be coupled to the spray arm 52 and fixed to the spray arm 52.
  • the arm holder 92 may rotate together with the spray arm 52, and may serve as a central axis of rotation of the spray arm 52.
  • the arm holder 92 may be rotatably fixed to the tub 12 while being coupled to the spray arm 52.
  • the arm holder 92 may be rotatably fixed to the sump cover (not shown). Wash water supplied from the washing pump 30 flows into the arm holder 92 and is then supplied to the spray arm 52.
  • the arm holder 92 may be integrally formed with the spray arm 52.
  • the flow path switching part 94 is disposed in the arm holder 92.
  • the flow path switching part 94 may switch the flow path of wash water supplied from the arm holder 92 to the spray arm 52.
  • the rotating gear part 96 may be rotatably mounted to the bottom surface of the spray arm 52. When the spray arm 52 is rotated, the rotating gear part 96 may perform a circular motion along the circumference of the fixed gear part 90 fixed to the sump cover while rotating in engagement with the fixed gear part 90.
  • the rotating gear part 96 may be rotatably disposed on a bottom of one of the first spray blade 56a and the second spray blade 56b. Referring to FIG. 10 , the rotating gear part 96 may be disposed on the bottom of the first spray blade 56a.
  • the first spray blade 56a is provided on its bottom with a first mounting protrusion 59a to which one side of the link member 98 is mounted.
  • the rotating gear part 96 may include a protrusion 96a that is spaced apart from a rotation axis of the rotating gear part 96 and protrudes to one side.
  • the protrusion 96a When the rotating gear part 96 rotates, the protrusion 96a may rotate at a position spaced apart from the center of the rotating gear part 96. The protrusion rotates as the rotating gear part 96 rotates, allowing the placement of the link member 98 to be changed.
  • the link member 98 may be mounted to the spray arm 52.
  • the link member 98 is connected at one side to the protrusion of the rotating gear part 96 and at the other side to the moving tube 88 of the moving blade 82.
  • the link member 98 moves in one direction as the rotating gear part 96 rotates, allowing the placement of the moving tube 88 to be changed.
  • the link member 98 may allow the moving tube 88 to perform a reciprocating rotational motion in a longitudinal direction.
  • the link member 98 is disposed around the hub 54.
  • the link member 98 includes a first extension portion 98a that is mounted to the first spray blade 56a, a second extension portion 98b that is mounted to the second spray blade 56b, a third extension portion 98c that is mounted to the bubble generator 60, and a fourth extension portion 98d that is mounted to the moving blade 82.
  • the first extension portion 98a is provided at its end portion with a first mounting groove 99a into which the first mounting protrusion 59a of the first spray blade 56a is inserted.
  • the first mounting groove 99a defines a long elliptical groove in a direction in which the first spray blade 56a extends. Accordingly, the first mounting groove 99a may guide the link member 98 to move in a longitudinal direction of the spray blade.
  • the first extension portion 98a is provided with a guide groove 99a1 into which the protrusion 96a of the rotating gear part 96 is inserted.
  • the guide groove 99a1 may define a long elliptical groove in a direction perpendicular to the first mounting groove 99a.
  • the guide groove 99a1 may convert a rotary motion of the protrusion 96a of the rotating gear part 96 to a linear motion of the link member 98 in one direction.
  • the link member 98 may perform a linear motion in the longitudinal direction of the spray blade.
  • the second extension portion 98b is provided at its end portion with a second mounting groove 99b into which a second mounting protrusion 59b formed on the second spray blade 56b is inserted.
  • the second mounting groove 99b has the same shape as the first mounting groove 99a, so as to guide the link member 98 to move in the longitudinal direction of the spray blade.
  • the third extension portion 98c is provided at its end portion with a third mounting groove 99c into which a third mounting protrusion 61 formed on the bubble generator 60 is inserted.
  • the third mounting groove 99c may have a long elliptical shape in the same direction as the first mounting groove 99a. Thus, the third mounting groove 99c may also guide the link member 98 to move in the longitudinal direction of the spray blade.
  • the fourth extension portion 98d is provided at its end portion with a fixing groove 99d into which a fixing protrusion 89 formed on a lower portion of the moving tube 88 is inserted.
  • the fixing protrusion 89 may be inserted into the fixing groove 99d, so that one end of the link member 98 and one side of the moving tube 88 may be fixed or secured. Accordingly, the moving tube 88 may move when the link member 98 moves in the longitudinal direction of the spray blade. In other words, the moving tube 88 may perform a reciprocating motion with respect to a rotation axis defined in a direction in which the moving blade 82 extends.
  • the rotation direction of the spray arm 52 may be changed from the first direction to the second direction.

Landscapes

  • Engineering & Computer Science (AREA)
  • Water Supply & Treatment (AREA)
  • Washing And Drying Of Tableware (AREA)
  • Massaging Devices (AREA)
  • Electron Tubes For Measurement (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
EP22763473.0A 2021-03-05 2022-01-28 Dishwasher Pending EP4302671A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020210029555A KR20220125563A (ko) 2021-03-05 2021-03-05 식기세척기
PCT/KR2022/001581 WO2022186488A1 (ko) 2021-03-05 2022-01-28 식기세척기

Publications (1)

Publication Number Publication Date
EP4302671A1 true EP4302671A1 (en) 2024-01-10

Family

ID=83154173

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22763473.0A Pending EP4302671A1 (en) 2021-03-05 2022-01-28 Dishwasher

Country Status (4)

Country Link
US (1) US20240148219A1 (ko)
EP (1) EP4302671A1 (ko)
KR (1) KR20220125563A (ko)
WO (1) WO2022186488A1 (ko)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102528669B1 (ko) * 2016-06-10 2023-05-04 엘지전자 주식회사 식기 세척기
KR102627981B1 (ko) 2016-08-04 2024-01-19 엘지전자 주식회사 에어젯 제너레이터 및 그를 포함하는 식기세척기
KR102410161B1 (ko) * 2017-03-09 2022-06-17 엘지전자 주식회사 식기세척기 및 그 제어방법
CN109589068B (zh) * 2017-09-30 2024-01-16 宁波方太厨具有限公司 一种清洗机
KR102041434B1 (ko) * 2018-10-01 2019-11-27 (주)지티앤 미세버블을 이용한 세척장치
CN111407205A (zh) * 2019-01-07 2020-07-14 宁波方太厨具有限公司 一种喷淋臂及应用有该喷淋臂的清洗机

Also Published As

Publication number Publication date
KR20220125563A (ko) 2022-09-14
US20240148219A1 (en) 2024-05-09
WO2022186488A1 (ko) 2022-09-09

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